<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box1{
            width: 200px;
            height: 100px;
            background-color: darkcyan;
            margin: 20px auto;

        }
        .box2{
            width: 200px;
            height: 100px;
            background-color: darkmagenta;
            border-left: 10px crimson solid;
            box-sizing: border-box;

        }
        .box3{
            width: 200px;
            height: 100px;
            background-color: aqua;
            padding: 10px;
            box-sizing: border-box;
            border-radius: 20px;

        }
    </style>
</head>
<body>

    <div class="box1">
        xxx

    </div>
    <div class="box2">
        ss

    </div>
    <div class="box3">
        cc

    </div>
    
</body>
</html>